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Measurement of the 171Tm beta spectrum

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arxiv 2307.09870 v2 pith:BWCYKG2P submitted 2023-07-19 nucl-ex physics.ins-det

Frédéric Juget , Maarten van Dijk , Emilio Andrea Maugeri , Maria Dorothea Schumann , Stephan Heinitz , Alexey Boyarsky , Ulli Köster , Lesya Shchutska
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Claude Bailat
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classification nucl-exphysics.ins-det
keywords spectrumbetaagreementenergymainmeasurementshapespectrometer
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The beta spectrum of the main transition of the beta-decay of 171Tm was measured using a double focalizing spectrometer. The instrument was lately improved in order to reduce its low energy threshold to 34 keV. We used the spectrometer to measure the beta spectrum end-point energy of the main transition of 171Tm decay using the Kurie plot formalism. We report a new value of 97.60(38) keV, which is in agreement with previous measurements. In addition, the spectrum shape was compared with the xi-approximation calculation where the shape factor is equal to 1 and good agreement was found between the theory and the measurement at the 1% level.

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